[ROVERNET - UK] Federal 3500S brakes sticking

Tom Trafton v8rover at earthlink.net
Tue Jan 31 17:03:07 GMT 2006


I just finished a rebuild of the servo unit in my Jag Mk II and can offer
the following thoughts;  check the vacuum hose itself to make sure that it
doesn't suffer from interior deterioration.  If the inner wall of the hose
is collapsing under vacuum it can act as a 'check valve' failing to release
vacuum thus keeping the brakes on until it bleeds down.  It wouldn't hurt to
simply replace the hose. Also advise Mr. Fox to get a good service manual so
he is sure that he has all the parts assembled correctly.  And ascertain
that the manifold mounted check valve is functioning correctly.

Hope this is of help.


----- Original Message ----- 
From: "Glen Wilson" <glenwilson at cavtel.net>
To: <rovernet at lyris.ccdata.com>
Sent: Tuesday, January 31, 2006 6:22 AM
Subject: [ROVERNET - UK] Federal 3500S brakes sticking

> I've tried to get a new acquaintance, Mr. Fox, subscribed to the list,
> but I don't see any postings from him. Please respond to this question
> and I'll pass the info on to him.
> Mr. Fox has a Federal 3500S in Nashville, TN which he has owned since
> 1975. He contacted me with a question about his brakes. He recently
> rebuilt the servo assembly and master cylinder. During the course of
> this work, he had the air check valve apart and wasn't certain how some
> of its internal pieces should be oriented when it was reassembled. He
> has been able to successfully bleed all of the calipers in the system,
> but the brakes are not working correctly. He has a very hard pedal feel,
> thinks he may not be getting any boost from the servo, and when the
> pedal is released the system is slow to free the wheels up. For a second
> or two after releasing the pedal, the brakes stay on.
> Any ideas?
> Mr. Fox sounds like he is a capable mechanic who generally knows what he
> is doing. He has the official Rover service manual in the binder which I
> am guessing is an actual workshop edition from a dealership. He also has
> the white hardcover owner's manual. I don't think he has the separate
> supplement for the Federal carbs, emissions, etc. but that info may be
> in the binder he has. Actually, he may not have federal carbs on the car
> because he told me the car had a Rochester carb fitted when he bought
> the car, and he had some SU carbs shipped over from a source in England
> and fitted to the car.
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